Research: I went through multiple commonly used financial spreadsheets to make a list of commonly used chartfields and terms.
Meetings with finance team members: I held multiple meetings with accountants, budget analysts and financial analysts to download their thoughts and consolidate their understanding of multiple financial terms into one spreadsheet.
Iteration: The dictionary went through many iterations, with feedback from a non-finance audience, accountants, and in order to capture the most accurate definitions and user-friendly format.
Presentation: The data dictionary was introduced at the department budget meetings, where I gave tutorials on how to use it.